5 months ago #2
The CG you're talking about is found during the blooming event to power up your girls' skills. It's located around the west/south-west area of the hub. After doing that blooming event, you can buy it from the shop.

The game is niche. It's also fairly easy to understand in a lot of areas granted some...confusing localization changes in text.
Wake me up when the world ends, so I can laugh in its face